Bittle- Light and Darkness

The material world, obstructs G-d's glory and the spiritual; and causes darkness. The more coarse (physical) the object is, the greater the darkness.

When one is tied to an emotion or desire, it blocks G-d's glory; and as a result, causes a great darkness. G-d's light, is then hidden from view.
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But as one purifies these emotions and desires, one also removes this darkness. And as the darkness departs, immediately the light of G-d's glory, begins to be shine.

When a person is worthy, of annihilating the darkness completely, and transforming it into absolute nothingness; then G-d's glory is revealed, to all the earth. Then there is no obstruction, and the light can shine through, in all its brilliance- Moshiach!